JPS5944194B2 - Hydraulic switchgear for portable tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic opening/closing device for a portable tool, which comprises a set of a portable working tool and a pedal equipped with a hydraulic pump mechanism for opening and closing the tool.

In general, in various machines and devices, a snap ring (also known as a C-type retaining ring) is fitted into a concave circumferential groove formed on the outer circumferential surface of the shaft or the inner circumferential surface of the shaft fitting hole. For example, pliers are widely used as work tools for this purpose, and their opening and closing action forcefully expands or contracts the snap ring. I'm letting you do it.

In the conventional type of pliers used for snap rings with a particularly large nominal diameter, a pair of left and right opening/closing arms each having a working pin form a figure 7 compass shape that is pivoted at one point. A pair of left and right operating knobs are separately pivotally connected in the middle of both arms, and a ratchet pawl, which is also fixed to the other bundle, is always locked to ratchet teeth integrally formed on one of the bundles. The arm is opened and closed by inserting and engaging the working pin into the through hole of the snap ring and closing the bundle with both hands.
The ratchet mechanism synchronized with this locks the degree of opening and closing in stages while deforming the snap ring.

However, with this, the operation bundle is long and heavy (and you have to hold it with both hands while operating it).
It is difficult to insert the working pin into the snap ring, and in a narrow space, it is difficult to attach and detach the snap ring from inside the concave circumferential groove, and deformation of the snap ring is achieved only by manual opening/closing force. Therefore, there is a problem that it requires a lot of labor and time, and the workability is significantly inferior.

On the other hand, unlike such pliers that open and close using only human power, there are also so-called pneumatic pliers that use compressed air force to open and close the working pins, but they depend on the compressed air temperature of a compressor etc. and their operation. Another problem is that long piping is required to introduce the air into the pliers, making it unusable in existing factories that do not have such ancillary equipment.Furthermore, the pliers are extremely difficult to carry. It is heavy, and it is difficult to open and close the working pin with a light lever operation using the fingertip while holding it with one hand, and there is still room for improvement in terms of work effort and operability. .

The present invention is intended to solve the problems of power tools typically exemplified by such snap ring pliers.
The specific configuration will be explained in detail based on the illustrated embodiment as follows.

That is, the present invention consists of a set of a hand-held work tool and a floor-mounted pedal for opening and closing the work tool. First, the work tool (in the figure, pliers for snap rings are shown as an example for comparison with the conventional product described above). are doing.

), 1 is a tool body, and a hydraulic cylinder 2 is defined inside thereof.

A cylinder closing plug 3 is detachably screwed onto the tool body 1, and also serves as a support for a return spring 5 of a hydraulic piston 4 that reciprocates within the cylinder 2.

The piston 4 is divided into a rondro side and a block T side, which allows for smooth sliding against the cylinder 2, and a piston backing 8 fixedly set on the block 7 side allows for smooth sliding between the cylinder 2 and the cylinder 2. It is oil-tight.

The tip of the piston rod 6 passes through the closing plug 3 and projects forward at all times, and a drive cam 9, such as a model or a conical shape, is detachably screwed onto the projecting portion.

Reference numeral 10 denotes a flexible hydraulic oil supply pipe, one end of which is connected to the cylinder 2 via a joint screw 11, and the other end thereof is connected to a master cylinder of a pedal, which will be described later.

Reference numeral 12 denotes an air release screw of the hydraulic cylinder 2, and the screw 12 and the joint screw 11 are covered by a cover 13 that is detachably screwed onto the rear end of the tool body 1.

14 is Bush.

Reference numeral 15 denotes a tool head, and a groove 16 for storing links is opened across the center of the tool head.

Reference numeral 17 designates a guide rod for moving the drive cam, which is drilled at the base of the 150-port cylinder of the head, and of course communicates with the split groove 16.

A distance collar fixing screw 18 is installed at the tip of the head 15 to prevent unauthorized opening of the groove 16.

Such a tool head 15 is integrally assembled with the tool body 1 so that it can be attached to and detached from the tool body 1.

In other words, the base end of the head 150 and the distal end of the tool body 1 are provided with identical threaded parts 19 and 20, and the coupling 21 is screwed across both threaded parts 19 and 20. By turning the head 15 from inside the coupling 21 and screwing it back, the head 1 is removed from the tool body 1.
5 can be removed and replaced.

A tip opening/closing mechanism as described below, which is operatively connected to the drive cam 9, is accommodated in the groove 16 of the tool head 15.

That is, in FIGS. 1 and 2, which clearly show the opening and closing mechanism for expanding the circumferential snap ring, 22.22 is the split groove 1.
A pair of left and right inner link pieces are arranged in parallel in the tool head 15, and each base end is connected to the tool head 15 with a pivot pin 23.2.
It is fixed by 3.

Reference numeral 24.24 denotes a passive cam such as a convex circular arc protruding from the inner wall surface of each inner link piece 22.22, and the pair of left and right passive cams 24.24 are always closed and connected to the drive cam 9. a helical spring 25 that presses in the direction of contact with the
is inserted and locked.

The helical spring 25 that connects and holds both inner link pieces 22.22 is retracted into the upper recess 26 of the split groove 16 to prevent unauthorized interference with the drive cam 9. Inner link piece 22.
22 can be moved back and forth within the recess 26.

In addition, 27.27 is a pair of left and right outer link pieces that together with the inner link pieces 22 and 22 form a so-called four-section parallel link mechanism, each of which has its base end connected to the pivot pin 2.
It is also fixed to the head 15 by 8.28.

29. 29 are the same (a pair of top pieces, each base end of which is connected to both types of link pieces 22, 22, 27 .
27, pivot pins 30, 30, 3L31, respectively.
They are connected in an occlusal manner.

Reference numerals 32 and 32 designate actuating pins that are implanted in parallel at the respective tips of the top pieces 29, 29, and the pair of actuating pins are of course inserted into and engaged with through holes (not shown) in the circumferential snap ring.

Although FIGS. 1 and 2 illustrate the opening/closing mechanism for expanding the circumferential snap ring, the tool head 15 equipped with this mechanism can be removed from the tool body 1 as described above, so only the head 15 can be removed from the tool body 1. As shown in FIG. 3, it can also be used in place of a tool head 15a with an opening/closing mechanism for contracting the Okawa snap ring.

That is, in the mechanism shown in FIG. 3, the top piece 29a.

The pair of pins 29a are always biased in the expanding direction by the helical spring 25a, and are closed as shown by the chain line in the figure by the forward movement of the drive cam 9a, thereby reducing the mutual distance between the two working pins 32a, 32a. It is specified that the

Therefore, in this case, the inner link pieces 22a, 2
2a is a pivot pin 23a attached to the tool head 15a at its midway portion.

23a, and is integrally equipped with a power arm part 33.33 extending rearward from the midway pivot part, and the inner wall surface of the arm part 33, 33 is also in constant contact with the drive cam 9a. They are set as cams 24a, 24a.

The rest of the configuration can be said to be substantially the same as the form in Figures 1 and 2, so in Figure 3, the common symbols with those in Figures 1 and 2 (same numbers with a subscript a) are written. Therefore, detailed explanation will be omitted.

The illustrated tip opening/closing mechanism consists of a symmetrical link mechanism, and a hydraulic piston 4 that reciprocates along the axis of symmetry.
Although the drive cam 9 is used to open and close the tool, it is of course not limited to this, and in short, any work tool that has a mechanism that can be opened and closed by the movement of the piston 4 to perform the required work,
The present invention can be applied.

Next, FIGS. 4 to 11 show a floor-standing pedal for opening and closing the above-mentioned work tool by foot pedal operation force,
This consists of a fixed base 34 and a movable footboard 35, and
A hydraulic plunger pump mechanism is provided which is operated by the force of pressing down the footboard 35.

That is, the fixed base 34 has a shallow box-like shape with an inverted U-shape in cross section, and a pair of left and right mounting masts 36.3 are installed in the front half of the fixed base 34.
6, and a partition mast 37 that partitions a narrow rank storage space between the two mounting masts 36, 36 are erected in parallel.

The movable footboard 35 covers this base 34 from above,
It also has the shape of a deep triangular box with an upright U-shape in cross section, and a pair of reinforcing stays 38, 38 are integrally suspended from the center of the interior.

The tread plate 35 is rotatably assembled to the base 34 by a horizontal pivot 39 inserted from the outside of the tread plate 35 so as to pass through the plurality of masts 36, 36, 37 and stays 38, 38. -ing

40 is a master cylinder installed in the rear half of the base 34 in a suspended manner by a plurality of fixing screws 41; 42 is an air bleed screw screwed into the rear end of the cylinder 400;
Reference numeral 43 designates a discharge case screwed into the rear end from the orthogonal direction in a continuous manner, 44 a cover nut screwed into this case 43, 45 a joint screw screwed into the cover nut 44, and the above-mentioned hydraulic oil supply. The pedal side end of the pipe 10 is communicatively connected to the master cylinder 40 by this joint screw 45.

46 is Bush.

47 is a plunger that reciprocates within the master cylinder 40, and its axis of movement lies in an orthogonal plane that coincides with the center line of the crank storage space.

48. 48 is a pair of backings attached to the circumferential surface of both ends of the plunger 470, 49 is both backings 48, 48
The hydraulic oil receiver, which is located between the plunger 47 and opened through the plunger 47, is an elongated hole for insertion, and 50 is a stopper for opening and closing the valve that is screwed into the cylinder 40 from below so as to stand up in the elongated hole 49. The pin 51 is a hydraulic oil master tank that is screwed into and fixed from above the cylinder 40 so as to face and communicate with the elongated hole 49, and itself functions to bleed air when the plunger moves back. .

52 is the tank cap, 53 is a hydraulic oil replenishment valve movably inserted into the end of the plunger 47,
It functions as a check valve that allows the hydraulic oil received in the elongated hole 49 from the tank 51 to flow through to the discharge chamber side of the master cylinder 40.

That is, when the plunger 47 moves back as shown in FIG. 10, this valve 53 collides with the Stocher pin 50, thereby allowing hydraulic oil to pass in the direction shown by the arrow in the figure, and from that state to the sixth position. When the flanger 47 is moved forward, the pane closes the oil passage to the plunger 47 and prevents the hydraulic oil from returning from the discharge chamber side of the cylinder 40 to the elongated hole 49 of the plunger 47. be.

54 is a hydraulic oil inflow hole provided in this valve 53; 55
56 is a case that is press-fitted to the end of the plunger 47 so as to cover the valve 53, and is inserted between the case 56 and the valve 53. The return spring 5T always presses the valve 53 in the direction of closing the hydraulic oil outflow hole 55.

Reference numeral 58 indicates a spring receiver, which is a hydraulic oil flow hole formed in the case 56, and reference numeral 59 indicates a return spring for the plunger 47.

The plunger 47 is previously separate from its bushing rod 60, and the bushing rod 60 and the step plate 35 are pivotally connected by a rank movement mechanism as follows.

That is, reference numeral 61 is a pivot shaft held by the tread plate 35 so as to cross the crank housing space, and the upper end of the single-shaped crank arm 62 is rotatably fixed to the tread plate 35 by this.

Reference numeral 63 denotes a horizontal pivot shaft which is passed through and held by the plurality of masts 36, 36, 37 of the base 34, by which the crank arm 64 of the figure 5 type is attached to the base 34 in the middle.

The lower end of the 5-shaped arm 64 and the bushing rod 60 of the plunger 47 and the upper end of the 5-shaped arm 64 and the lower end of the 1-shaped arm 62 are connected to pivot pins, respectively. 65, 66 are connected in an occlusal manner.

Therefore, the rotational movement caused by the foot operation of the treadle 350 is converted into a linear movement action of the plunger 47 via the rank movement mechanism, and the plunger 47, master cylinder 40, hydraulic oil replenishment handle 53, etc. The plunger pump mechanism consisting of is activated, and the hydraulic piston 4 in the hand-held power tool is moved in conjunction with the hydraulic pressure.

Further, reference numeral 67 denotes a stop wall protruding from approximately the center of the base 34 in a chevron shape, 68 is an adjustment dial screwed inward from approximately the center of the footboard 35, and 69 is an adjustment dial of this dial 68. The cap nut is screwed onto the tip of the screw and has an approximately elliptical cross section, and is restrained in a non-rotatable state within the above-mentioned stays 3B and 3B of the footboard 35, and when the dial 68 is turned from the outside, the cap nut is closed. The nut 69 advances and retreats, and its tip properly hits the inclined surface of the stopper wall 67, thereby making it possible to adjust the degree of downward rotation of the treadle 35 and, by extension, the movement stroke of the plunger 47 in advance. It has become.

To is a retaining ring for the dial 68.

In the case of the illustrated example, the tread plate 35 and the plunger 47 are operatively connected by a crank movement mechanism using both the 1-shaped and L-shaped crank arms 62 and 64, but in short, the tread plate 350 can be operated by stepping on the tread plate 350. Any mechanism that operates the plunger pump is sufficient; therefore, for example, when the plunger 47 is pressed down, the plunger 47 is moved.
It is also possible that the two are directly connected.

A detailed explanation of the present invention configured as described above will be as follows.

In other words, when using the work tool (pliers) shown in Figures 1 and 2 to fit a circumferential snap ring into various machines and devices, the work tool and the hydraulic oil supply pipe 10 of the required length are used. The step plate 35 of the floor-standing pedal connected to the pedal is repeatedly depressed with the foot as shown in FIG. 8 from the state shown in FIG. 10.

By doing so, the hydraulic oil entering the discharge chamber side of the master cylinder 40 from the master tank 51 in the preparation state of FIG. By closing the flow path of the valve 53 due to the movement, the water is fed under pressure from the supply pipe 10 into the hydraulic cylinder 2 of the working tool,
The pressure pump action causes the hydraulic piston 4 of the power tool to move forward, and the drive cam 9 of the hydraulic piston 4 causes the top piece 29.29 of the tip opening/closing mechanism to move forward.
The working pins 32 and 32 are pushed open as shown by the chain lines in FIG.

Therefore, by stepping on the pedal while holding the power tool in your hand, you can attach and detach the snap ring very easily and efficiently.

Furthermore, even when using a partially converted work tool as the Okawa snap ring shown in Fig. 3, the above pedal depression and its pumping action are exactly the same, and the working pins 32a, 32a are opened and closed by the tip opening/closing mechanism. Conversely, it is closed as shown by the chain line in the figure.

In either case, when the foot pressure on the pedal is released, the pusher 47 of the pump mechanism is restored from the state shown in FIG. 8 to the state shown in FIG. The hydraulic piston 4 with the cam 9 is moved backward by the urging force of the helical spring 25 and the return spring 5.

As described above, the hydraulic opening/closing device for a portable tool according to the present invention is a handheld work tool equipped with a pressure cylinder 2 and a tip opening/closing mechanism that is opened and closed by the movement of its piston 4, and a hydraulic oil master. Since it is a used set consisting of a tool operating pedal equipped with a tank 51 and a foot pump mechanism for pumping the hydraulic oil into the hydraulic cylinder 2, and a flexible hydraulic oil supply pipe 10 that communicates and connects the two, The work tool is lightweight and compact enough to be held with one hand, and by stepping on the pedal, the work tool can be used to expand or contract the snap ring with extremely high efficiency and with little effort. Other predetermined tasks can be performed.

Furthermore, compared to the conventional work tools that require a compressed air source as mentioned at the beginning, the pedal, which is equipped with a hydraulic oil master tank 51 and a pump mechanism, can be freely carried along with the work tool and can be used as desired. It is extremely convenient to handle because it can be fixed or simply placed on the floor.

Furthermore, if the work tool is a removable combination of the tool body 1 and the tool head 15, and the former is equipped with a hydraulic cylinder 2 and piston 4, and the latter is equipped with a tip opening/closing mechanism suitable for the work, then While it can be used as the tool body 1, it can be used for desired work simply by replacing and mounting the head 15, making it convenient and economical to use, and in any case can be said to be excellent in practical use.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention applied to pliers for snap rings, and Fig. 1 is a side sectional view of the power tool;
Fig. 2 is a partial sectional view taken along line 2-2 in Fig. 1, Fig. 3 is a partial sectional view of a modified example corresponding to Fig. 2, Fig. 4 is a bottom view of the pedal, and Fig. 5 is a partial sectional view of a modification example corresponding to Fig. 2. Figure 6 is a cross-sectional view taken along line 6-6 in Figure 5, Figure 7 is the same (partial cross-sectional view taken along line 7-7, and Figure 8 is a partial cross-sectional view taken along line 8-8 in Figure 6). 9 is a sectional view taken along line 9-9 of FIG. 8, FIG. 10 is a sectional view of the treadle restoring action state corresponding to FIG. 8, and FIG.
It is a sectional view taken along the line -11. 1... Tool body, 2... Hydraulic cylinder, 4... Hydraulic piston, 10... Hydraulic oil supply pipe, 15... Tool head, 32,
32, 32a, 32a...Work pin, 34...
... Base, 35 ... Treadboard, 40 ...
・Master cylinder, 47... Plunger, 51... Master tank, 53...
Hydraulic oil replenishment valve, 60... Butsch rod.

Claims (1)

[Scope of Claims] 1. A hand-held power tool equipped with a hydraulic cylinder and a tip opening/closing mechanism that is opened and closed by movement of the piston; A hydraulic opening/closing device for a portable tool, comprising: a tool operating pedal equipped with a foot pump mechanism for supplying pressure to the hydraulic cylinder; and a flexible hydraulic oil supply pipe that communicates and connects the hydraulic cylinder and the pump mechanism. 2 The work tool is divided into a tool body with a built-in hydraulic cylinder and a tool head equipped with a tip opening/closing mechanism,
A hydraulic opening/closing device for a portable tool according to claim 1, wherein the two are detachably assembled and integrated. 3. The hydraulic opening/closing device for a portable tool according to claim 1, wherein the working tool is pliers for expanding or contracting a snap ring.